Batwing LED with remote phosphor configuration

Abstract

An LED emitter uses a molded lens with phosphor material embedded in a circumferential trench to generate a batwing beam pattern. After the lens is molded over a package substrate with connected LED dies thereon, the phosphor material is molded, injected, or dispensed into a circumferential trench. The molded lens is shaped such that a majority of the light emitted by the one or more LED dies is reflected by the top surface to the side surfaces through the phosphor material.

What is claimed is: 
     
       1. An optical emitter comprising:
 one or more Light-Emitting Diode (LED) dies; 
 a package substrate attached to one side of the one or more LED dies; 
 electrical connections between the one or more LED dies and terminals on the package substrate; 
 a molded lens bonded to the package substrate directly contacting the one or more LED dies, said molded lens configured to transmit light from the one or more LED dies in a batwing pattern; and, 
 phosphor material embedded in the molded lens in a circumferential cylinder shape. 
 
     
     
       2. The optical emitter of  claim 1 , further comprising a high reflectivity coating on a top surface of the molded lens. 
     
     
       3. The optical emitter of  claim 2 , wherein the high reflectivity coating includes a metal or a metal oxide. 
     
     
       4. The optical emitter of  claim 2 , wherein the high reflectivity coating covers the entire top surface of the molded lens. 
     
     
       5. The optical emitter of  claim 1 , wherein the one or more LED dies are at least four LED dies disposed around a center point on the package substrate. 
     
     
       6. The optical emitter of  claim 1 , wherein the one or more LED dies are configured to emit a blue light. 
     
     
       7. The optical emitter of  claim 6 , wherein the circumferential cylinder has a varying thickness. 
     
     
       8. The optical emitter of  claim 1 , wherein the molded lens includes a top surface having a cavity shaped to internally reflect light emitted by the one or more LED dies to the side surfaces of the lens. 
     
     
       9. The optical emitter of  claim 1 , wherein the molded lens is a silicone, a resin, an epoxy, or a poly(methyl methacrylate) (PMMA). 
     
     
       10. The optical emitter of  claim 1 , wherein the electrical connections connect the one or more LED dies in series and connect end LED dies to terminals on the package substrate. 
     
     
       11. The optical emitter of  claim 1 , wherein the molded lens base is a circle. 
     
     
       12. A display comprising:
 a plurality of optical emitters, each optical emitter comprising: 
 a plurality of Light-Emitting Diode (LED) dies; 
 a package substrate attached to one side of the plurality of LED dies; 
 electrical connections connecting the LED die and the package substrate; 
 a molded lens bonded to the package substrate directly contacting the one or more LED dies, said molded lens configured to transmit light from the one or more LED dies in a batwing pattern; and, 
 phosphor material circumferentially embedded in the molded lens.